sleek is a todo app based on todo.txt, free and open-source.
nheko
The motivation behind the project is to provide a native desktop app for Matrix that feels more like a mainstream chat app (Element, Telegram etc) and less like an IRC client.
iptux
iptux is an “IP Messenger” client for Linux.
Vnote
VNote is a Qt-based, free and open source note-taking application, focusing on Markdown now. VNote is designed to provide a pleasant note-taking platform with excellent editing experience.
Gajim
A fully-featured XMPP client
Element
Secure and independent communication, connected via Matrix
Trilium
Trilium Notes is a hierarchical note taking application with focus on building large personal knowledge bases.
Super Productivity
Put a task into your project for today or schedule it to another day to keep your head free.
Write
Write is a word processor for handwriting.
Whalebird
Whalebird is a mastodon client for desktop application.